How do I "create a service account called BESAdmin" in the Exchange Management Shell?

Please help!

Thanks!

I try to create a new user with that name, make them an Exchange Administrator, but when I run the first command in step 3 I get:

Add-ExchangeAdministrator : The input object cannot be bound to any parameters
for the command either because the command does not take pipeline input or the
input and its properties do not match any of the parameters that take pipeline
input.
At line:1 char:55
+ get-mailboxserver server04 | add-exchangeadministrator <<<< BESadmin -role V
iewOnlyAdmin